Refactoring for parallel processing of islands, collision detection and constraint solving.

Extras/PhysicsInterface/CcdPhysics/ParallelPhysicsEnvironment.h

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+/*
+Bullet Continuous Collision Detection and Physics Library
+Copyright (c) 2003-2006 Erwin Coumans  http://continuousphysics.com/Bullet/
+
+This software is provided 'as-is', without any express or implied warranty.
+In no event will the authors be held liable for any damages arising from the use of this software.
+Permission is granted to anyone to use this software for any purpose, 
+including commercial applications, and to alter it and redistribute it freely, 
+subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
+2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
+3. This notice may not be removed or altered from any source distribution.
+*/
+
+#ifndef PARALLELPHYSICSENVIRONMENT
+#define PARALLELPHYSICSENVIRONMENT
+
+#include "CcdPhysicsEnvironment.h"
+class ParallelIslandDispatcher;
+
+
+/// ParallelPhysicsEnvironment is experimental parallel mainloop for physics simulation
+/// Physics Environment takes care of stepping the simulation and is a container for physics entities.
+/// It stores rigidbodies,constraints, materials etc.
+/// A derived class may be able to 'construct' entities by loading and/or converting
+class ParallelPhysicsEnvironment : public CcdPhysicsEnvironment
+{
+	
+
+	public:
+		ParallelPhysicsEnvironment(ParallelIslandDispatcher* dispatcher=0, OverlappingPairCache* pairCache=0);
+
+		virtual		~ParallelPhysicsEnvironment();
+
+		
+		/// Perform an integration step of duration 'timeStep'.
+		bool						proceedDeltaTimeOneStep(float timeStep);
+
+};
+
+#endif //PARALLELPHYSICSENVIRONMENT